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#!/usr/bin/python
# copyright 2002-2010 LOGILAB S.A. (Paris, FRANCE), all rights reserved.
# contact http://www.logilab.fr/ -- mailto:contact@logilab.fr
#
# This file is part of logilab-constraint.
#
# logilab-constraint is free software: you can redistribute it and/or modify it
# under the terms of the GNU Lesser General Public License as published by the
# Free Software Foundation, either version 2.1 of the License, or (at your
# option) any later version.
#
# logilab-constraint is distributed in the hope that it will be useful, but
# WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
# FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License
# for more details.
#
# You should have received a copy of the GNU Lesser General Public License along
# with logilab-constraint. If not, see <http://www.gnu.org/licenses/>.
"""
Example problem with intervals
"""
from logilab.constraint import Repository, Solver, fi
def intervals(size=5, verbose=0):
variables = []
domains = {}
constraints = []
for i in range(size):
name = "v%02d" % i
variables.append(name)
domains[name] = fi.FiniteIntervalDomain(0, size * 5, 5)
for i, q1 in enumerate(variables):
if i + 1 == len(variables):
continue
q2 = variables[i + 1]
c = fi.StartsAfterEnd(q1, q2)
constraints.append(c)
# print domains
# print constraints
r = Repository(variables, domains, constraints)
yield from Solver(fi.FiniteIntervalDistributor()).solve_all(r, verbose)
def main(args=None):
import sys
import getopt
if args is None:
args = sys.argv[1:]
opts, args = getopt.getopt(args, "dvf")
display = 0
verbose = 0
first = 0
if args:
size = int(args[0])
else:
size = 8
for o, v in opts:
if o == "-d":
display = 1
elif o == "-v":
verbose += 1
elif o == "-f":
first = 1
count = 0
for sol in intervals(size, verbose):
count += 1
if display:
print(sol)
print("*" * 80)
if first:
break
if not display:
print("Use -d option to display solutions")
print(count, "solutions found.")
if __name__ == "__main__":
# import hotshot
# p = hotshot.Profile('/tmp/queens.prof')
# p.runcall(main)
# p.close()
main()
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